JPH0291716A - File server - Google Patents

Abstract

PURPOSE:To guarantee the safety of data and to improve the performance by putting >=2 disk drives in parallel operation and doubling files with the same performance with one drive. CONSTITUTION:When a file store (write) instruction is sent to a microprocessor(MPU) through a communication controller(CCU) 3, the MPU writes a file on hard disk drives(HDD) 5 and 6 from a main storage device(MMU) 2 through a system bus 4. In this disk writing operation, the controllers of the HDDs 5 and 6 interpret the write instruction in the same way respectively to perform the same operation, so that the same performance with one drive is obtained. When a load (read) instruction is sent, on the other hand, only the HDD #0 5 operates normally to load the read data onto the MMU 2 and the read data is loaded again at this time. Thus, the same HDDs are put in parallel operation for writing and switched and operated for reading to double files with the same performance. Consequently, the safety of data is guaranteed and the performance is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a file server that improves data security.

(Prior Art) In order to guarantee the safety of data in file servers, etc., the following methods have conventionally existed. One method is to read and verify after writing. The other method is to make the file a double structure (write the same data in two places).

Still another method is to use a cassette MT or the like to carry out the transfer.

(Problems to be Solved by the Invention) All of the above methods are disadvantageous in terms of performance and time. Specifically, it has various disadvantages such as being slow, time consuming, and wasteful.

This invention has been made in view of the above circumstances, and aims to provide a file server that guarantees data safety and improves performance.

[Structure of the Invention (Means and Effects for Solving the Problems) The present invention realizes duplication of files with the same performance as a single disk by operating two or more disks in parallel. It is something. Specifically, when writing a disk, the same data is written on two disks at the same time, and when reading a disk, the specified disk is read from each disk, thereby duplicating the file and switching disks in case of an error. This improves data security by reading the data.

(Example) Hereinafter, an example of the present invention will be described in detail using the drawings. FIG. 1 is a schematic diagram showing an embodiment of the present invention. In the figure, l is a microprocessor (MPU), which is a process that controls the system, and l is a file server. 2 is a main memory unit (MMU), which is a primary memory that stores programs, data, and the like. A communication control unit (CCU) 3 has a communication function with other systems. 4 is a system bus, which commonly connects the modules making up the system. 5.6 is /S-
You can use the hard disk drive (HDD) to download programs,
Memory that permanently stores data, etc.

Hereinafter, the operation of the embodiment of the present invention will be explained in detail. FIG. 1 shows an embodiment of the present invention in a file server system, in which a CCU 3 is connected to other systems (terminals, etc.). When a file store (write) command is transmitted from a terminal (not shown) to the MPU 1 through the CCU 3,
The MPU l writes the file found on the MMUZ to the IDDs 5 and 6 via the system bus 4.

In this disk write operation, 5 (HDD+0)
.

Each of the 6 (HDD+1) disk controllers interprets the write command in the same way and executes the same operation. Therefore, the performance will be the same as when there is only one unit.

On the other hand, in a load (read) instruction, it is usually indicated by 5)I
Only DD+O operates and loads read data into MMU2. At this time, the read data can be loaded again.

In this way, by operating the same HDD in parallel during writing and switching between operations during reading, file duplication can be achieved with the same performance.

[Effects of the Invention] According to the present invention as explained above, 74 of the important files
It is possible to realize check-a-zoo without being aware of it, contributing to data security guarantee and performance improvement.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention. l...Microprocessor (MPU), 2...Main memory unit (MMU), 3...Communication control unit (CAN)
), 4...System bus, 5.6...Hard disk drive (HDD) Applicant's representative Patent attorney Takehiko Suzue Figure 1

Claims (1)

[Claims] In a file system that has a configuration of multiple disks, when writing to a disk, the same data is written to multiple disks at the same time, and when reading from a disk, the data is read from each specified disk, and files are multiplexed accordingly to prevent errors. A file server that is characterized by switching the disk and reading it if there is one.